a = [66.51, 113, 113, 3, 3354.5]
print(a.count(113), a.count(66.51), a.count('x'))
a.insert(1, -1)
a.append(333)
print(a)
a.index(113)
a.remove(333)
print(a)
a.reverse()
print(a)
a.sort()
print(a)